• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Selective Breeding

Extracts from this document...


´╗┐Selective Breeding in Plants and Animals Selective Breeding in Plants Desired Characteristics plants are bred for: * Decorative plants are selectively bred for colour. * Food plants are selectively bred for better yield. * Most plants are selectively bred to be hardier. * Most plants are selectively bred for resistance against disease. * Some plants are selectively bred for fragrance. * Some plants are selectively bred for texture and taste. Breeding for Characteristics The definition of selective breeding is: The act of breeding two adult organisms to get offspring with desired characteristics The breeder would breed two adults that have the desired characteristic, then he would keep on breeding the younger generations, choosing the offspring with the strongest sense of that characteristic and thus as the generations get further and further the characteristic being breed for would become stronger. Selective breeding can also allow the combination of two adults feature for example if you wanted an orange coloured plant you could breed a red and a yellow coloured plant to get the genes to have a co - dominant relationship. Selective Breeding in Plants (notes) In farming the farmers need to make the most profit that is possible so they breed the plants to get offspring that give a very high yield. To breed the plants they must put them in controlled conditions to stop any contamination from any other pollen. Then the plants are pollinated by the farmers using a brush to ensure that the right plants are pollinated. ...read more.


a reduced resistant to a specific disease and by narrowly breeding you are making the allele more dominant so if the crop is released it could be a flop due to this. * Yes these plants should be kept as they may have desired characteristics that we will need later in time for example there may be a disease that is killing all of the plants and one of the older crops that aren?t as efficient in growing have that specific resistance thus are able to be grown and selectively breed with the plants so they get the resilience from the specific disease. Selective breeding in animals Desired characteristic for animals are: * High yield for example a sheep that produces a lot of wool and a cow that creates lots of milk. * Efficiency in creating matter, for example an animal is better if it needs less feed to make the same 1kg of protein and meat. * Better qualities of yield for example in sheep stronger wool or in a pig nicer tasting food. * Resistance from disease as its better if more animals survive overall. * Appearance for example dogs are selectively breed for better coats * Fitness levels as animals like horses are used for racing so having two fast horse will give an fast offspring Selective breeding in animals (notes) Humans have controlled and domesticated animals for hundreds of years, the reasons for are food, materials and aides to life. ...read more.


* 2) She would first of all breed both plants to get red plants that are red and big or red and small, white and big, white and small. Then using the big and red and white and red and small you will get a red and medium, then you breed the red and big repeatedly to get the red to a bigger size until it?s a red big plants. * 3) a) the sheep have adapted to the hot weather thus have less wool, to get more wool they buy the sheep from Europe which have more wool so they can selectively breed one with more yield thus profit. * B) The European and Australian sheep breeds wont be ready for the climate so they could die out and so to stop this they breed them with the Indian sheep that are already resilient to the conditions. * C) The farmer first breeds the first generation together than he chooses the offspring with the required characteristics and breeds them. Then he repeats this process to refine the specific characteristic thus he will breed the animals successfully. * 4) a) we could do a D.N.A test, if the genetics are mostly similar then they are the same breed. * B) A black goldfish could have arisen from a mutation * C) The reason they have been bred is because g goldfish are a pet so to get nicer varieties the fish breeders get better colours so they are the best breeders so really for competition. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Variation and Inheritance section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Variation and Inheritance essays

  1. Peer reviewed

    Cellular Reproduction

    4 star(s)

    you mixed a tall allele with a short one, the plant would always come out tall. The only way for a recessive trait to affect the organism would be to have two recessive alleles. Meaning, a recessive trait could only be brought out by having two of the same alleles.

  2. What is population genetics and how is it put to practical use?

    and the phenotype (stabilising selection). An example of this would be in sickle cell anaemia in African populations where malaria is prevalent. Being homozygous for the sickle cell mutation results in an early death whereas being heterozygous confers some resistance to malaria over the homozygous wild type.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work